Caulking coupling device, switch and transmission switch

Abstract

A punch includes a first caulking surface and a second caulking surface caulking margins of which axially differ in depth and sequentially formed in a peripheral direction, and includes a regulating surface opposing an outer peripheral surface of a caulking process portion to the first caulking surface of the first and second caulking surfaces, which has a deeper caulking margin, wherein the regulating surface regulates radial fillet movement by caulking of the caulking process portion to promote the fillet movement to the second caulking surface of the first and second caulking surfaces, which has a less deep caulking margin.

What is claimed is: 
     
       1. A switch comprising:
 a shaft provided with a caulking process portion on an outer periphery thereof, the outer periphery of the shaft having a pair of opposing flat portions and an opposing pair of arcuate portions to form a racetrack configuration as viewed in plan view; and 
 a movable board having a bore portion fitted on the shaft, wherein the caulking process portion is caulked to an edge portion of the bore portion with a predetermined caulking margin to form a caulking portion to the movable board and to couple the shaft to the movable board by caulking, wherein: 
 the caulking portion is configured to sequentially provide at least one thin fillet portion, an axial thickness of which is relatively thin, and at least one thick fillet portion, an axial thickness of which is relatively thick, in a peripheral direction of the shaft, 
 wherein the at least one thick fillet portion is formed as an integral construction with one of the pair of arcuate portions of the shaft and extends partially therealong in the peripheral direction, 
 wherein the at least one thin fillet portion is formed as an integral construction with the same one of the pair of arcuate portions and the at least one thick fillet portion, and 
 wherein the at least one thin fillet portion extends along the same one of the pair of arcuate portions from the at least one thick fillet portion in the peripheral direction to terminate at one of the pair of opposing flat portions. 
 
     
     
       2. A transmission switch for the switch according to  claim 1 , wherein:
 the shaft includes a manual shaft in an automatic transmission; and 
 the movable board includes a detent plate in the automatic transmission.